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Flexible hole expanding device and method

A flexible and reaming seat technology, which is applied in drilling equipment and methods, earthwork drilling, construction, etc., can solve the problems of easy fatigue damage, high stress, and affecting drilling retreat, so as to improve reaming efficiency and reduce reaming Cost, the effect of ensuring reliability

Pending Publication Date: 2020-09-29
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also reaming bits on the market that drive the expansion and contraction of the reaming arm through the hydraulic support, but in the prior art, the setting of the reaming arm is not ideal for reaming. High stress, easy fatigue damage, and when the reaming arm shrinks, it is easy to clamp large coal particles between the drill pipe, resulting in insufficient shrinkage, affecting the drill back, increasing the cost of reaming, and the construction of reaming cannot be guaranteed efficiency

Method used

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  • Flexible hole expanding device and method
  • Flexible hole expanding device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0026] like Figure 1~2 As shown, the present invention provides a flexible reaming device, comprising a drill rod 1, a reaming seat 2 and a drill bit 3, the two ends of the reaming seat 2 are respectively connected with the drill bit 3 and the drill rod 1, and the drill The end of the rod 1 far away from the reaming seat 2 is connected to the reduction motor (not shown in the figure), and the reaming seat 2 is provided with a flexible reaming chain 4, and the flexible reaming chain 4 is made of high-strength wear-resistant metal material , the high-strength wear-resistant metal material is selected from 27SiMn material. And the flexible reaming chain 4 is pierced with a high-pressure hose 5, the drill pipe 1 and the reaming seat 2 are provided with a high-pressure water channel 6 connected to each other, and the high-pressure hose 5 communicates with the high-pressure water channel 6. One end of the high-pressure hose 5 away from the reaming seat 2 is open or closed. The fl...

Embodiment 2

[0029] like Figure 1~2 As shown, the present invention also provides a flexible hole reaming method based on the flexible hole reaming device described in Embodiment 1, comprising the following steps:

[0030] 1) Drilling positioning: measure and set out the line according to the coal seam conditions to locate the drilling position;

[0031] 2) Drilling: First, use an ordinary gas drainage drilling rig to drill an ordinary hole through the rock layer to the coal seam. The diameter of the ordinary hole is 113mm. Stop drilling when the depth of the ordinary hole reaches the designed position, and withdraw the ordinary bit;

[0032]3) Reaming: Put the reaming seat 2 of the flexible reaming device into the coal seam through the rock layer along the ordinary drill hole, start the deceleration motor, drive the drill pipe 1 to rotate, and make the flexible reaming chain 4 swing under the action of inertia , in order to improve the cutting strength of the flexible reaming chain 4 on...

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Abstract

The invention belongs to the technical field of coal mine drilling, and particularly relates to a flexible hole expanding device and method. The flexible hole expanding device comprises a drill rod, ahold expanding seat and a drill bit; the drill bit and the drill rod are connected with two ends of the hole expanding seat respectively; a reduction motor is connected with one end, away from one end of the hold expanding seat, of the drill rod in a transmission mode; a flexible hole expanding chain or cable is arranged on the flexible hole expanding seat; the flexible hole expanding chain or cable adopts high-strength wear-resisting metal materials; a high-pressure hose is arranged in the flexible hole expanding chain or cable in a penetrating mode; high-pressure water courses are arrangedin the drill rod and in the hole expanding seat and communicate with each other; the high-pressure hose communicate with the high-pressure water courses; and the end, away from the hole expanding seat, of the high-pressure hose is open or closed. The flexible hole expanding device is used for expanding a normal coal mine drill hole, the reliability of the hole expanding device is improved, the hole expanding cost is lowered, and the hole expanding efficiency of coal mine drill holes is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of coal mine drilling, and in particular relates to a flexible hole reaming device and method. Background technique [0002] Before coal mining, it is necessary to drill holes to extract gas. When drilling, it is necessary to drill from the rock layer to the coal seam. The boreholes in the coal seam section are reamed to expand the surface area of ​​the inner holes in the coal seam and improve the gas overflow efficiency. [0003] Chinese patent document CN201810392039.0 discloses a soil layer variable-diameter mechanical reaming drill bit and a drilling method using the drill bit. The torque is transmitted through the drill bit and the transmission rod. Small-diameter drilling; when the reaming drill enters the bottom of the hole, pressure is applied through the transmission rod, and the telescopic arm of the reaming expands outward. The second connecting rod inlaid with alloy particles 5 acts as the reami...

Claims

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Application Information

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IPC IPC(8): E21B10/32E21B7/28E21B7/18E21B3/02
CPCE21B3/02E21B7/18E21B7/28E21B10/322
Inventor 李辉刘勇魏建平温志辉徐向宇王登科司磊磊李波张宏图张健姚邦华
Owner HENAN POLYTECHNIC UNIV
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